 Go Big or Go Home: Clay's 914-6, MS3Pro Wiring in Progress |
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| Maltese Falcon |
 Jan 18 2026, 07:34 PM
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#401
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914 Guru  Group: Members Posts: 5,203 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None   |
The cabin/ interior side of the cover plate, dig the Karmann coachwork badge>> found it at the L A. Lit show ¡
The alternator bump-out is not too invasive into the cabin.  |
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| mepstein |
Jan 18 2026, 07:41 PM
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#402
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914-6 GT in waiting Group: Members Posts: 20,572 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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Attached thumbnail(s) 
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| Maltese Falcon |
Jan 18 2026, 07:48 PM
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#403
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914 Guru Group: Members Posts: 5,203 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
QUOTE(mepstein @ Jan 18 2026, 05:41 PM)  ... I'm sure a good panel beater can heat + shape a cool dimple in this Alternator area for Clay (IMG:style_emoticons/default/thumb3d.gif) |
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| ClayPerrine |
Jan 19 2026, 07:07 AM
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#404
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Life's been good to me so far..... Group: Admin Posts: 16,542 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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Marty,
The kit came with a little 70 amp alternator. That won't work for me. I have to have amperage to run the electric AC compressor. I need about 250 to 300 amp alternator output. I am not running a distributor on mine, so the alternator is going to be mounted way lower in the space where the distributor was mounted. If I have to, I can put in a dimple in the firewall to accommodate the alternator pulley. I am also going to run it with one v-rib belt rather than the second belt from the fan drive pulley, with an idler above the Clewett dynamic tensioner. That will make the belt run in a T path and keep t low to clear the firewall. This is the alternator I plan on using... https://www.mechman.com/400-amp-fits-6-12-c...m-fitment-only/ 400 amp, and a computer controlled regulator. It is a small case, so it should mount low in the distributor space. |
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| ClayPerrine |
Jan 19 2026, 07:11 AM
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#405
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Life's been good to me so far..... Group: Admin Posts: 16,542 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(mepstein @ Jan 18 2026, 07:41 PM) ... Your quote is spot on. I am NOT cutting a hole in the firewall. I will dimple it to accommodate the alternator pulley, but NO HOLES. |
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| rick 918-S |
Jan 19 2026, 07:14 AM
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#406
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Hey nice rack! -Celette Group: Members Posts: 21,234 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region
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I like that! (IMG:style_emoticons/default/thumb3d.gif)
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| Maltese Falcon |
Jan 19 2026, 09:59 AM
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#407
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914 Guru Group: Members Posts: 5,203 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
Clay, make sure that the Clewett pulleys, belts, and their ratios are close to your horizontal fan specifications ; keep the air flow rates close/ or same as the Porsche design.
Air flow chart for you >>  |
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| ClayPerrine |
Jan 26 2026, 02:21 PM
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#408
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Life's been good to me so far..... Group: Admin Posts: 16,542 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(Maltese Falcon @ Jan 19 2026, 09:59 AM) Clay, make sure that the Clewett pulleys, belts, and their ratios are close to your horizontal fan specifications ; keep the air flow rates close/ or same as the Porsche design. Air flow chart for you >> Marty, Would you please measure the crank pulley diameter for me? I don't know the original size, and I have no way to get it. The pulley on the flat fan is the same size as the Clewett pulley on the 964 fan. So it will be the same fan speed. But the fan is slightly smaller, so it looks like it will flow less air. |
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| mepstein |
Jan 26 2026, 02:48 PM
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#409
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914-6 GT in waiting Group: Members Posts: 20,572 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Not necessarily. Fan shape is really important for efficiency and performance. I don’t know this for a fact but I read that the 964 fan flows less air but is quieter than earlier 911 fans. It would be interesting to know if the design of the flat fan was optimized for race speeds/rpm’s.
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| Maltese Falcon |
Jan 28 2026, 07:52 PM
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#410
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914 Guru Group: Members Posts: 5,203 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
Clay, the o/dia of the Crank pulley>>measured with a caliper at the outer edges of the serpentine surface is 4.452"
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